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Sink: Don't sink static allocas from the entry block

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CodeGen treats allocas outside the entry block as dynamically sized
stack objects.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204473 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard
2014-03-21 15:51:51 +00:00
parent 20115c69f5
commit 1b05bb2900
2 changed files with 86 additions and 0 deletions
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7
lib/Transforms/Scalar/Sink.cpp
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@ -216,6 +216,13 @@ bool Sinking::IsAcceptableTarget(Instruction *Inst,
/// instruction out of its current block into a successor.
bool Sinking::SinkInstruction(Instruction *Inst,
SmallPtrSet<Instruction *, 8> &Stores) {
// Don't sink static alloca instructions. CodeGen assumes allocas outside the
// entry block are dynamically sized stack objects.
if (AllocaInst *AI = dyn_cast<AllocaInst>(Inst))
if (AI->isStaticAlloca())
return false;
// Check if it's safe to move the instruction.
if (!isSafeToMove(Inst, AA, Stores))
return false;